Syringe force amplification device
First Claim
1. Apparatus for amplifying the manual force applied to compress the plunger of a syringe into its barrel, comprising:
- a frame having means for attachment to the barrel of a syringe;
a carriage mounted on said frame so as to be moveable relative thereto along the longitudinal axis of a syringe attached to the frame, said carriage including means for engaging the plunger of a syringe;
a gear rotatably mounted on said carriage and operatively engaging said frame such that rotation of said gear induces movement of said carriage along said axis; and
manually actuatable means for rotating said gear with a mechanical advantage such that the linear force applied to the plunger of a syringe connected to said carriage is greater than the force that is manually applied to rotate said gear.
3 Assignments
0 Petitions
Accused Products
Abstract
A syringe assist device including a frame and moveable carriage that are respectively attached to a conventional syringe and its plunger. The frame has a toothed rack and the carriage contains a force amplifying gear and lever mechanism. A thumb ring transmits the force applied by the user'"'"'s thumb to the lever to rotate the gear and move the carriage along the frame. This action in turn applies amplified compression to the syringe plunger. A ratchet connection between the lever and the gear enables the movement of the carriage to be continued without force amplification when the lever has reached the end of its stroke.
152 Citations
14 Claims
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1. Apparatus for amplifying the manual force applied to compress the plunger of a syringe into its barrel, comprising:
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a frame having means for attachment to the barrel of a syringe; a carriage mounted on said frame so as to be moveable relative thereto along the longitudinal axis of a syringe attached to the frame, said carriage including means for engaging the plunger of a syringe; a gear rotatably mounted on said carriage and operatively engaging said frame such that rotation of said gear induces movement of said carriage along said axis; and manually actuatable means for rotating said gear with a mechanical advantage such that the linear force applied to the plunger of a syringe connected to said carriage is greater than the force that is manually applied to rotate said gear. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device for increasing the compressive force that is manually applied to a syringe, comprising:
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a frame having means for attachment to the barrel of a syringe and including a pair of opposed racks of teeth; a carriage mounted for movement between said racks of teeth along a path of travel parallel thereto, said carriage having means for engaging the plunger of a syringe attached to said frame; a pair of pinion gears rotatably disposed on said carriage and respectively engaging said racks of teeth; a pair of levers respectively engaged for rotation with said pinion gears, each of said levers having an operative length greater than the radius of its associated pinion gear to thereby provide a mechanical advantage; and a plunger connected to said levers and adapted to be manually translated to pivot said levers and thereby move said carriage relative to said frame due to the interaction between the rotating gears and the rack teeth. - View Dependent Claims (9, 10, 11, 12, 13)
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14. Apparatus for amplifying the manual force applied to compress the plunger of a syringe into its cylinder, comprising:
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a frame having means for attachment to the barrel of a syringe; a carriage mounted on said frame so as to be moveable relative thereto and including means for engaging the plunger of a syringe attached to said frame; means adapted to be manually moved to apply a linear force to said carriage; and means operatively disposed between said force applying means and said frame for moving said carriage along said frame with a mechanical advantage such that the force applied to the plunger of a syringe by said carriage is greater than the manual force applied to said force applying means.
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Specification